Beloved actor Andy Griffith died of a heart attack, according to the death certificate filed today with Dare county officials, the Associated Press reports. Griffith suffered the heart attack 24 hours before he died at 7 a.m. Tuesday, and he was laid to rest in the family cemetery on his estate on Roanoke Island hours after his death.

A spokesperson for the funeral home tells CNN says the service had been planned for some time: "This was the wish of his family."

Griffth, who played good-hearted Sheriff Andy Taylor on "The Andy Griffith Show" and cantankerous lawyer Ben Matlock on "Matlock," suffered from coronary artery disease and hypertension. He was 86.